06-10-2021, 03:11 PM | #1 |
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Wheel Width + Offsets for 305 square?
Hey fellow track rats; I have an F82 riding on JRZ RS Pro 2-ways, GC plates (sitting at -3.5 front, -2 rear), all the great SPL bits front and rear, along with AP/Essex Brakes (9668/9449).
I'm currently running the tried-and-true 18x10 ET25 fronts and 18x11 ET44 rears. I would very much like a way to fit a square set under the car to make rotating and prolonging my tires lives a possibility. What offsets/suspension mods am I looking at to get either 295 square AR1s, or 305 square Pirelli DHs underneath the car comfortably? I've researched the M4 GT4's wheel set, but I was looking for some data from the experts here. Thank you! Last edited by ment4t; 06-10-2021 at 03:34 PM.. |
06-11-2021, 05:14 AM | #3 |
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That's not a true square setup, you cannot do front to rear rotations on the fly...
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06-11-2021, 05:51 PM | #6 |
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I would assume that even with the 18x10.5 in the front you have to make sure that:
1) you have a tire diameter that is 26" or less (660 or 645mm slick) to prevent rubbing on the inner fender plastic liner (unless you shape it with a heat gun) 2) the front coilover threaded perch sits ABOVE the tire so the tire tucks in close to the shock body. (otherwise you have to run a big spacer 20+mm) |
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06-11-2021, 08:59 PM | #7 | |
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06-11-2021, 10:46 PM | #8 |
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06-11-2021, 10:51 PM | #9 | |
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06-12-2021, 07:25 AM | #10 | |
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06-16-2021, 05:38 AM | #11 |
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Sorry, I interpreted your post as if you had different wheel width and offsets front and rear. Read too fast
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06-19-2021, 05:10 PM | #12 |
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I might try the following setup myself:
(2) M4 GT4 OEM front ET30 and (2) Richland Forged M4GT4 Replica ET44. Yes two of the rims won't have the red SAI motorsport and 'M Performance' imprint in the wheel but I doubt no one will notice. This way you don't have to worry about the problematic ET30 rear offset. |
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06-21-2021, 02:41 PM | #13 | |
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06-21-2021, 07:22 PM | #14 | |
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For others that don't want to mess with changing all the arms in the rear, then having the ET44 option in the back solves this problem. You could always go to your tire shop and swap the tires for $80. (20 per wheel). I'm curious though, how many times do regular track junkies with square setup rotate their tires on average? |
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06-21-2021, 10:17 PM | #15 |
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I follow the wear, if its hot or there is a heavy bias of left or right turns ill move the front to the rear (maybe just one side) halfway through a weekend.
My 305/30/19 Square RE71R was still building tons of heat in the front on high 85-90deg days. These are coupled with 19x10.5 Apex Arc8 in +35mm (25mm front spacer, no rear spacer). Been thinking about throwing on a +5mm spacer on the rear for full StanceBoi looks on the street haha. Im running -3deg camber in the rear with my spl arms. |
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06-25-2021, 04:11 PM | #17 |
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Has anyone given you a hard time about running spacers that large? From my research, it seems like it's a non-issue; however there seems to be some contingent that swears them off.
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06-28-2021, 09:16 AM | #19 | |
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I don't have the math skillz to prove it, but maybe others do? |
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06-28-2021, 11:50 AM | #20 |
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I was weary at first, but ordered extended studs with just enough length to grab every thread on the nut and that's it. Then the M2 CSR came out and it runs 40 or 41mm spacer in the front. I immediately felt better about my decision and never gave it another thought. I will however have extra studs on hand.
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